Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much
 
PerlMonks  

Re: Re: Puzzle: need a more general algorithm

by Anonymous Monk
on Jul 10, 2002 at 12:35 UTC ( #180735=note: print w/ replies, xml ) Need Help??


in reply to Re: Puzzle: need a more general algorithm
in thread Puzzle: need a more general algorithm

Very good. Pre-memoization you are exponential. With memoization your memory usage scales like O(n**3), and your performance is O(n**4). If you passed the array by reference, and added 2 indices, you would drop a factor of n off of both.

By contrast the efficient algorithm is sub-exponential pre-memoization, and is sub-quadratic after.

Which shows that good algorithms are a big win, but being straightforward, and then applying well-known speedups to that, can still result in a usable algorithm.

  • Comment on Re: Re: Puzzle: need a more general algorithm

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://180735]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (4)
As of 2016-06-26 20:29 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    My preferred method of making French fries (chips) is in a ...











    Results (331 votes). Check out past polls.